How I Met Your Mother and Phineas and Ferb Crossovers
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Neil Patrick Harris was Right by HiroLemonFan reviews
When Ferb learns about The Mermaid Theory, he tells Isabella and Phineas about it.
Rated: T - English - Humor - Chapters: 1 - Words: 548 - Reviews: 8 - Favs: 11 - Follows: 4 - Published: 11/22/2011 - Ferb - Complete